RubyDavid , you write as though Mirage is a different software than TVPaint (?) . But Mirage was just "TVP 7.0" , with different branding . When TVPaint took over distributing their software again they upgraded it and simply changed the name back to TVPaint . (at that time TVPaint v.8.0 . Since then it's been through versions 8.5 , 8.6 , 9.0 , 9.5 , 10.0 and now 10.5 )

By changing from Mirage to TVPaint you lose nothing (all the functions of Mirage are still there or significantly improved) and many new functions have been introduced over the years .